diff --git a/tools/bootconfig/scripts/ftrace2bconf.sh b/tools/bootconfig/scripts/ftrace2bconf.sh
index 6183b36c68466151fa7ec76df836a952a9a6c70b..1603801cf1264c42f143180915871b29023ed30f 100755
--- a/tools/bootconfig/scripts/ftrace2bconf.sh
+++ b/tools/bootconfig/scripts/ftrace2bconf.sh
@@ -93,7 +93,7 @@ referred_vars() {
 }
 
 event_is_enabled() { # enable-file
-	test -f $1 & grep -q "1" $1
+	test -f $1 && grep -q "1" $1
 }
 
 per_event_options() { # event-dir